This year NATO will celebrate its 60th anniversary. So far the world's most powerful military alliance has been a remarkable success story. However, as the first decade of the new century draws to a close there appears to be a widening strategic rift among the allies.
'Two-tier NATO' is by now an established piece of shorthand in international strategic debate to indicate an 'alliance Ã la carte' divided into two or more factions of member states with divergent interests. Evidently, the alliance increasingly struggles to reach consensus on a whole range of strategic issues.